Electromagnetic radiation shield for an optical subassembly
View Patent ↗In one example embodiment, an electromagnetic radiation (EMR) shield includes a central portion, a plurality of arms extending radially outward from the central portion, and a substantially centrally located opening defined in the central portion. The perimeter of the central portion is approximately the same size and shape as that of a portion of an associated optical subassembly (OSA).
1. An electromagnetic radiation (EMR) shield comprising:
a central portion whose perimeter is approximately the same size and shape as that of a portion of an associated optical subassembly (OSA);
a plurality of arms extending radially outward from the central portion, each arm including a breakaway portion in which an aperture is defined, each aperture configured to mate with a corresponding structure of an injection mold in order to position the EMR shield within the mold such that no portion of the material injected into the mold flows through the apertures; and
a substantially centrally located opening defined in the central portion.
2. The EMR shield as recited in claim 1 , wherein the EMR shield comprises stamped sheet metal.
3. The EMR shield as recited in claim 1 , further comprising a notch that defines a portion of a fluid passageway defined along the perimeter of the central portion.
4. The EMR shield as recited in claim 1 , wherein the central portion is substantially planar.
5. The EMR shield as recited in claim 1 , wherein the opening is defined in a substantially centrally located indentation defined in the central portion.
6. The EMR shield as recited in claim 1 , wherein the plurality of arms extending radially outward from the central portion comprises two or more arms extending radially outward from the central portion at substantially regular intervals.
7. An OSA comprising:
a body formed from an optically transmissive plastic material, the body comprising:
a receptacle;
a neck extending from the receptacle;
a flange extending from the neck;
a barrel extending from the flange, the barrel defining a cavity, the cavity having a diameter; and
an EMR shield at least partially embedded in the body, the EMR shield comprising:
a central portion; and
a plurality of arms extending radially outward from the central portion; and
a substantially centrally located opening defined in the central portion, the opening having a diameter that is smaller than the diameter of the cavity, the opening being filled with a portion of the optically transmissive plastic material.
8. The OSA as recited in claim 7 , further comprising a plurality of notches defined along the perimeter of the central portion, wherein a portion of the plastic material is positioned within the notches.
9. The OSA as recited in claim 7 , further comprising a transducer housed in the receptacle.
10. The OSA as recited in claim 7 , wherein the EMR shield comprises stamped stainless steel sheet metal.
11. The OSA as recited in claim 7 , wherein a portion of each arm extends outside the body and provides spring action to bias against a complementary structure of an optoelectronic module housing.
12. The OSA as recited in claim 7 , wherein the opening is defined in a substantially centrally located indentation defined in the central portion, and at least a portion of the indentation extends into the neck.
13. The OSA as recited in claim 7 , wherein the plurality of arms extending radially outward from the central portion comprises four arms extending radially outward from the central portion at substantially regular intervals.
14. An optoelectronic module comprising:
a housing;
a printed circuit board (PCB) at least partially positioned within the housing; and
an OSA at least partially positioned within the housing and electrically connected to the PCB, the OSA comprising:
a body comprising:
a receptacle with an optical transducer disposed therein;
a neck extending from the receptacle;
a flange extending from the neck;
a barrel extending from the flange, the barrel defining a cavity, the cavity having a diameter;
a first lens integrally defined within the neck; and
a second lens integrally defined within the receptacle; and
an EMR shield at least partially embedded in the body, the EMR shield comprising:
a central portion;
a plurality of arms extending radially outward from the central portion, each of the plurality of arms including a portion that extends outside the body and is biased against the housing; and
a substantially centrally located opening defined in the central portion, the opening having a diameter that is smaller than the diameter of the cavity, wherein the opening is positioned between the first lens and the second lens such that optical signals can pass between the first lens and the second lens through the opening.
15. The optoelectronic module as recited in claim 14 , wherein the optoelectronic module has a form factor that is substantially compliant with one of the following MSAs: SFF, SFP, XFP, XPAK, X2, or XENPAK.
16. The optoelectronic module as recited in claim 14 , wherein the opening is defined in a substantially centrally located indentation defined in the central portion, and at least a portion of the indentation extends into the neck.
17. The optoelectronic module as recited in claim 14 , wherein the plurality of arms extending radially outward from the central portion comprises four arms extending radially outward from the central portion at substantially regular intervals.
18. The EMR shield as recited in claim 3 , wherein the opening is the only perforation defined in the central portion.
19. The EMR shield as recited in claim 1 , wherein the breakaway portion of each arm is defined between a score-line and a distal end of the arm.
20. The OSA as recited in claim 7 , wherein the body further comprises:
a first lens integrally defined within the neck; and
a second lens integrally defined within the receptacle,
wherein the opening is positioned between the first lens and the second lens such that optical signals can pass between the first lens and the second lens through the opening.